Here's the link to the PDF.
According to a PDF from a Sony media/investor conference, Sony is calling the Sony Online Service a "revenue stream."
Here's the link to the PDF - http://www.sony.net/SonyInfo/IR/info/strategy/pdf/200911presen.pdf
The Sony Online Service, which is first mentioned on page 20 of the PDF, will integrate several devices and offer premium content.
Here are some details on the PDF:
Listed under 5 Key Advantages of PlayStation 3 - PlayStation Network:
*Rich lineup of content (game and nongame - video, comic, etc.)
*Q2 FY2010: release non-game software development kit
*New revenue stream from subscription
The PDF is filled with other juicy morsels of information.